#!/bin/sh # gzexe: compressor for Unix executables. # Use this only for binaries that you do not use frequently. # # The compressed version is a shell script which decompresses itself after # skipping $skip lines of shell commands. We try invoking the compressed # executable with the original name (for programs looking at their name). # We also try to retain the original file permissions on the compressed file. # For safety reasons, gzexe will not create setuid or setgid shell scripts. # WARNING: the first line of this file must be either : or #!/bin/sh # The : is required for some old versions of csh. # On Ultrix, /bin/sh is too buggy, change the first line to: #!/bin/sh5 # Copyright (C) 1998, 2002 Free Software Foundation # Copyright (C) 1993 Jean-loup Gailly # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA # 02111-1307, USA. PATH="/usr/bin:$PATH" x=`basename $0` if test $# = 0; then echo compress executables. original file foo is renamed to foo~ echo usage: ${x} [-d] files... echo " -d decompress the executables" exit 1 fi set -C tmp=gz$$ trap "rm -f $tmp; exit 1" HUP INT QUIT TRAP USR1 PIPE TERM : > $tmp || exit 1 decomp=0 res=0 test "$x" = "ungzexe" && decomp=1 if test "x$1" = "x-d"; then decomp=1 shift fi echo hi > zfoo1$$ || exit 1 echo hi > zfoo2$$ || exit 1 if test -z "`(${CPMOD-cpmod} zfoo1$$ zfoo2$$) 2>&1`"; then cpmod=${CPMOD-cpmod} fi rm -f zfoo[12]$$ tail="" IFS="${IFS= }"; saveifs="$IFS"; IFS="${IFS}:" for dir in $PATH; do test -z "$dir" && dir=. if test -f $dir/tail; then tail="$dir/tail" break fi done IFS="$saveifs" if test -z "$tail"; then echo cannot find tail exit 1 fi case `echo foo | $tail -n +1 2>/dev/null` in foo) tail="$tail -n";; esac for i do if test ! -f "$i" ; then echo ${x}: $i not a file res=1 continue fi if test $decomp -eq 0; then if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then echo "${x}: $i is already gzexe'd" continue fi fi if ls -l "$i" | grep '^...[sS]' > /dev/null; then echo "${x}: $i has setuid permission, unchanged" continue fi if ls -l "$i" | grep '^......[sS]' > /dev/null; then echo "${x}: $i has setgid permission, unchanged" continue fi case "`basename $i`" in bzip2 | tail | sed | chmod | ln | sleep | rm) echo "${x}: $i would depend on itself"; continue ;; esac if test -z "$cpmod"; then cp -p "$i" $tmp 2>/dev/null || cp "$i" $tmp if test -w $tmp 2>/dev/null; then writable=1 else writable=0 chmod u+w $tmp 2>/dev/null fi : >| $tmp # truncate the file, ignoring set -C fi if test $decomp -eq 0; then sed 1q $0 >> $tmp sed "s|^if tail|if $tail|" >> $tmp <<'EOF' skip=23 set -C umask=`umask` umask 77 tmpfile=`tempfile -p gztmp -d /tmp` || exit 1 if tail +$skip "$0" | /bin/bzip2 -cd >> $tmpfile; then umask $umask /bin/chmod 700 $tmpfile prog="`echo $0 | /bin/sed 's|^.*/||'`" if /bin/ln -T $tmpfile "/tmp/$prog" 2>/dev/null; then trap '/bin/rm -f $tmpfile "/tmp/$prog"; exit $res' 0 (/bin/sleep 5; /bin/rm -f $tmpfile "/tmp/$prog") 2>/dev/null & /tmp/"$prog" ${1+"$@"}; res=$? else trap '/bin/rm -f $tmpfile; exit $res' 0 (/bin/sleep 5; /bin/rm -f $tmpfile) 2>/dev/null & $tmpfile ${1+"$@"}; res=$? fi else echo Cannot decompress $0; exit 1 fi; exit $res EOF bzip2 -cv9 "$i" >> $tmp || { /bin/rm -f $tmp echo ${x}: compression not possible for $i, file unchanged. res=1 continue } else # decompression skip=23 if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then eval `sed -e 1d -e 2q "$i"` fi if tail +$skip "$i" | bzip2 -cd > $tmp; then : else echo ${x}: $i probably not in gzexe format, file unchanged. res=1 continue fi fi rm -f "$i~" mv "$i" "$i~" || { echo ${x}: cannot backup $i as $i~ rm -f $tmp res=1 continue } mv $tmp "$i" || cp -p $tmp "$i" 2>/dev/null || cp $tmp "$i" || { echo ${x}: cannot create $i rm -f $tmp res=1 continue } rm -f $tmp if test -n "$cpmod"; then $cpmod "$i~" "$i" 2>/dev/null elif test $writable -eq 0; then chmod u-w $i 2>/dev/null fi done exit $res